JP2007132694A - Thermal degradation evaluating/testing method of pneumatic tire - Google Patents

Thermal degradation evaluating/testing method of pneumatic tire Download PDF

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JP2007132694A
JP2007132694A JP2005323366A JP2005323366A JP2007132694A JP 2007132694 A JP2007132694 A JP 2007132694A JP 2005323366 A JP2005323366 A JP 2005323366A JP 2005323366 A JP2005323366 A JP 2005323366A JP 2007132694 A JP2007132694 A JP 2007132694A
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tire
temperature
thermal deterioration
pneumatic tire
heating
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JP4687401B2 (en
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Yukio Tozawa
幸雄 兎沢
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal degradation evaluating/testing method of a pneumatic tire capable of accurately performing a durability test of the tire in line with the market in a short time in a room. <P>SOLUTION: In the thermal degradation evaluating/testing method of the pneumatic tire, a part on the circumference of a tire tread section Wt, namely a shoulder section Sx on one side shown by Fig.2, is heated by a band-like heating means 2. The heated region by the heating means 2 is between 1/6 (60°) and 1/3 (120°) on the full circumference (360°) of the tire tread section Wt, preferably 1/4 (90°). The heated region of the tire tread section Wt is the full circumference or a part in the tire circumferential direction in a part from the center of the tire tread section to the shoulder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、空気入りタイヤの熱劣化評価試験方法に係わり、更に詳しくはタイヤの外周の一部に不均一な熱歪みを与える（加熱する）ことでタイヤ熱劣化状態を室内試験で迅速に評価することが出来るタイヤの熱劣化評価試験方法に関するものである。   The present invention relates to a thermal deterioration evaluation test method for a pneumatic tire. More specifically, the thermal deterioration state of a tire is quickly evaluated in an indoor test by imparting (heating) non-uniform thermal distortion to a part of the outer periphery of the tire. It is related with the thermal degradation evaluation test method of the tire which can be performed.

従来、高温環境下に曝されたタイヤにおいて、そのタイヤに生じる経時的劣化に於ける耐久性を評価するための耐久試験方法としては種々のものが提案されている。   Conventionally, various methods have been proposed as durability test methods for evaluating the durability of a tire exposed to a high temperature environment in terms of deterioration over time.

例えば、第１の耐久試験方法としては、タイヤ内に高濃度の酸素を注入し、経時後、タイヤをそのまま若しくは酸素を排出し、空気を注入して実耐久試験を行う空気入りタイヤの耐久試験方法（例えば、特許文献１参照）、第２の耐久試験方法としては、静止した無負荷状態のタイヤにおいて、タイヤ充填圧とタイヤの加熱温度とを適正に設定することにより、高温環境下で実使用されたタイヤの特にクラウン部において生じる経時的劣化に伴うクリープ挙動を短時間で効率良く模倣出来るようにしたタイヤの耐久試験方法（例えば、特許文献２参照）等である。   For example, as a first durability test method, a high-concentration oxygen is injected into a tire, and after a lapse of time, the tire is left as it is or oxygen is exhausted, and air is injected to perform an actual durability test. As a method (for example, see Patent Document 1) and a second durability test method, the tire filling pressure and the heating temperature of the tire are set appropriately in a stationary and no-load tire, and the test is performed in a high temperature environment. A tire endurance test method (see, for example, Patent Document 2) that can efficiently imitate the creep behavior associated with the deterioration over time of a used tire, particularly in a crown portion, in a short time.

然しながら、このような従来の耐久試験方法は、タイヤ内に高濃度の酸素を注入した酸化劣化が主体であったり、またタイヤのクラウン部全周をウォーマー（加熱装置）により加熱して経時的劣化に伴う耐久性を試験するもので、必ずしも市場のあらゆる劣化耐久性を満足するものではなかった。   However, such a conventional durability test method mainly involves oxidative deterioration in which high concentration of oxygen is injected into the tire, or the entire crown of the tire is heated by a warmer (heating device) to deteriorate over time. This test is for the durability associated with the test, and does not necessarily satisfy all the deterioration durability in the market.

即ち市場のある種のタイヤは、必ずしもタイヤ全体が加熱されるものではなく、タイヤ踏面部の一部が熱歪み劣化される場合があり、不均一な熱歪み劣化に対しては精度の高い熱劣化耐久性試験を行うことが難しいと言う問題があった。   In other words, some tires on the market do not necessarily heat the entire tire, and a part of the tire tread may deteriorate due to thermal distortion. There was a problem that it was difficult to conduct a deterioration durability test.

そこで、本願発明者等は種々の実験の結果、タイヤの経時的熱劣化耐久性の試験としては、タイヤの少なくとも一部に熱を与えることが市場に即したタイヤの耐久性を試験することが出来ることを見出した。   Therefore, as a result of various experiments, the inventors of the present application can test the durability of a tire in accordance with the market by applying heat to at least a part of the tire as a test for durability against thermal deterioration of a tire over time. I found what I can do.

即ち、従来のようにタイヤ全体を加熱した場合には、熱劣化不均一と歪み不均一による耐久性にかかわる不均一熱歪み劣化を評価することができなかった。
特開平９─１３３６１１号公報 特開２００３−２６２５６８号公報 That is, when the entire tire is heated as in the prior art, it has not been possible to evaluate non-uniform thermal strain degradation related to durability due to non-uniform thermal degradation and non-uniform strain.
JP-A-9-133611 JP 2003-262568 A

この発明はかかる従来の問題点に着目し、市場に即したタイヤの耐久性試験を、室内において短時間に精度良く試験を行うことが出来る空気入りタイヤの熱劣化評価試験方法を提供することを目的とするものである。   This invention pays attention to such a conventional problem, and provides a thermal deterioration evaluation test method for a pneumatic tire that can accurately test a tire durability test in accordance with the market in a short time in a room. It is the purpose.

この発明は上記目的を達成するため、タイヤ踏面部周上の一部を、加熱手段により加熱することを要旨とするものである。   In order to achieve the above object, the gist of the present invention is to heat a part of the tire tread surface circumference by a heating means.

ここで、前記加熱手段による加熱領域は、タイヤ踏面部全周上の１／３以下，１／６以上であり、前記タイヤ踏面部の加熱領域は、ショルダー部片側のタイヤ周方向の長さに対して、相対向する側のタイヤ周方向の長さの比を、同じ、または0.89〜0.97に設定するものである。   Here, the heating area by the heating means is 1/3 or less and 1/6 or more on the entire circumference of the tire tread surface portion, and the heating area of the tire tread surface portion is a length in the tire circumferential direction on one side of the shoulder portion. On the other hand, the ratio of the lengths in the tire circumferential direction on opposite sides is set to the same or 0.89 to 0.97.

また、前記タイヤ踏面部の加熱領域は、タイヤ踏面部センターから片側のショルダー部分で、タイヤ周方向の全周または部分的であり、前記タイヤ踏面部の加熱領域の温度は、表面温度を６０〜１００°Ｃで、かつこの温度状態を９６時間以上維持させることが望ましい。 また、タイヤ踏面部の加熱領域の温度は、加熱領域中心部の温度に対して、加熱領域周方向両端の温度を１０〜３０°Ｃ低くなるように設定し、前記加熱領域の温度は、一方のショルダー部側の温度に対して、他方のショルダー部側の温度差を１０〜３０°Ｃに設定するものである。   The heating area of the tire tread portion is a shoulder portion on one side from the center of the tire tread portion, and is the entire circumference or a partial circumference in the tire circumferential direction. It is desirable to maintain this temperature state at 100 ° C. for 96 hours or more. Further, the temperature of the heating area of the tire tread is set so that the temperature at both ends in the circumferential direction of the heating area is 10 to 30 ° C. lower than the temperature of the center of the heating area. The temperature difference on the other shoulder portion side is set to 10 to 30 ° C. with respect to the temperature on the shoulder portion side.

また、前記加熱手段として、伝導熱を用い、前記タイヤの加熱時に、タイヤ内に空気を充填して行うものである。また前記タイヤの加熱時に、タイヤ内に酸素濃度が６０％以上の気体を充填して行うことも可能である。   Further, as the heating means, conduction heat is used, and the tire is filled with air when the tire is heated. Moreover, it is also possible to fill the tire with a gas having an oxygen concentration of 60% or more when the tire is heated.

この発明は、上記のようにタイヤ踏面部周上の一部を、加熱手段により加熱してタイヤの熱劣化に於ける耐久試験を行うので、以下のような優れた効果を奏するものである。
(a).市場に即したタイヤの熱劣化耐久試験を短時間に効率良く行うことが出来る。
(b).市場に即したタイヤの熱劣化耐久試験を室内試験により精度良く行うことが出来る。(c).タイヤの開発精度が向上し、タイヤの開発時間も短縮することが出来る。 In the present invention, as described above, a part of the tire tread surface is heated by the heating means and the durability test in the thermal deterioration of the tire is performed. Therefore, the following excellent effects can be obtained.
(a) It is possible to efficiently perform a heat deterioration durability test of a tire in line with the market in a short time.
(b) The tire thermal deterioration durability test in line with the market can be accurately performed by the laboratory test. (c) Tire development accuracy can be improved and tire development time can be shortened.

以下、添付図面に基づき、この発明の実施形態を説明する。
図１は、この発明の空気入りタイヤの熱劣化評価試験方法を室内で行う試験装置の概略構成図を示し、１は試験タイヤＷｘを縦向きに取付ける支持装置、２は試験タイヤＷｘの片側のショルダーＳｘを所定幅Ｈで、かつ試験タイヤＷｘの周方向に所定の長さＬ加熱する帯状の加熱手段を示し、前記加熱手段２はゴムシート３ａの内部にヒータ３ｂが埋設され、ゴムシート３ａ全体を熱伝導により加熱するように構成されている。なお、３ｃは加熱手段２のヒータ３ｂに接続された電気コードを示している。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a test apparatus for performing a thermal deterioration evaluation test method for a pneumatic tire according to the present invention indoors. A belt-like heating means for heating the shoulder Sx with a predetermined width H and a predetermined length L in the circumferential direction of the test tire Wx is shown. The heating means 2 has a heater 3b embedded in the rubber sheet 3a, and the rubber sheet 3a. The whole is heated by heat conduction. Reference numeral 3c denotes an electric cord connected to the heater 3b of the heating means 2.

この発明の空気入りタイヤの熱劣化評価試験方法においては、タイヤ踏面部Ｗｔの周上の一部、即ち、図２に示す片側のショルダー部Ｓｘを前記帯状の加熱手段２により加熱、または両ショルダー部にわたって加熱するものであるが、加熱手段２による加熱領域としては、タイヤ踏面部Ｗｔの全周（３６０度）上の１／３（１２０度）以下，１／６（６０度）以上で、好ましくは、１／４（９０度）が望ましい。また前記タイヤ踏面部Ｗｔの加熱領域は、タイヤ踏面部センターから片側のショルダー部分の場合は、タイヤ周方向の全周または部分的である。   In the thermal deterioration evaluation test method for a pneumatic tire according to the present invention, a part of the circumference of the tire tread surface Wt, that is, one shoulder portion Sx shown in FIG. 2 is heated by the belt-shaped heating means 2 or both shoulders. The heating area by the heating means 2 is 1/3 (120 degrees) or less, 1/6 (60 degrees) or more on the entire circumference (360 degrees) of the tire tread surface Wt, Preferably, 1/4 (90 degrees) is desirable. Further, the heating region of the tire tread surface portion Wt is the entire circumference or a partial portion in the tire circumferential direction in the case of a shoulder portion on one side from the tire tread surface portion center.

このように、加熱領域と非加熱領域を作ることで、加熱による劣化レベルが変わり、その差が明確になる。各領域は１／３以上及び１／６以下では劣化レベルの差が十分でないことが判った。また、前記タイヤ踏面部Ｗｔの加熱領域は、タイヤ踏面部全幅を加熱する場合はショルダー部Ｓｘの片側のタイヤ周方向の長さＬａに対して、相対向する側のショルダー部Ｓｙのタイヤ周方向の長さＬｂの比を、同じ（Ｌａ＝Ｌｂ）か、または0.89〜0.97、好ましくは0.91〜0.95に設定するものである。劣化レベルを変えて、その差を見るためである。   Thus, by making a heating area | region and a non-heating area | region, the deterioration level by heating changes and the difference becomes clear. It was found that the difference in deterioration level was not sufficient when each region was 1/3 or more and 1/6 or less. The heating region of the tire tread surface portion Wt is the tire circumferential direction of the shoulder portion Sy on the opposite side with respect to the length La of the tire circumferential direction on one side of the shoulder portion Sx when heating the entire width of the tire tread surface portion. The ratio of the lengths Lb is the same (La = Lb) or 0.89 to 0.97, preferably 0.91 to 0.95. This is to change the deterioration level and see the difference.

実際の実験では、タイヤ周方向の長さの比が上記の値となるように、試験タイヤＷｘ上を別の比熱の大きい材料（例えば、タイヤトレッドの切れ端等）で覆うことにより実験を行う。   In an actual experiment, the experiment is performed by covering the test tire Wx with another material having a large specific heat (for example, a piece of a tire tread) so that the ratio of the length in the tire circumferential direction becomes the above value.

前記タイヤ踏面部Ｗｔの加熱領域の温度は、表面温度を６０〜１００°Ｃで、かつこの温度状態を９６時間（４日間）以上維持させる。２４時間走行でタイヤ温度６０°Ｃ以下では加熱時間が長過ぎて実際的ではなく、１００°Ｃ以上では劣化状態が異なる。４日間以上で市場レベルの劣化を知ることが可能となる。   The temperature of the heating area of the tire tread surface Wt is such that the surface temperature is 60 to 100 ° C. and this temperature state is maintained for 96 hours (4 days) or more. If the tire temperature is 60 ° C. or less after running for 24 hours, the heating time is too long to be practical, and the deterioration state is different at 100 ° C. or more. It will be possible to know the deterioration of the market level in 4 days or more.

前記タイヤ踏面部Ｗｔの加熱領域の温度は、加熱領域中心部の温度に対して、加熱領域周方向両端の温度を１０〜３０°Ｃ低くなるように設定し、また前記加熱領域の温度は、一方のショルダー部側の温度に対して、他方のショルダー部側の温度差を１０〜３０°Ｃ、好ましくは１５°Ｃに設定する。   The temperature of the heating area of the tire tread surface Wt is set so that the temperature at both ends in the circumferential direction of the heating area is 10 to 30 ° C. lower than the temperature of the center of the heating area, and the temperature of the heating area is The temperature difference on the other shoulder portion side is set to 10 to 30 ° C., preferably 15 ° C., with respect to the temperature on the one shoulder portion side.

また、試験時には試験タイヤＷｘを加熱する際、タイヤ内に空気を充填して行うか、またはタイヤ内に酸素ボンべ等により酸素濃度が６０％以上の気体を充填して行うことが、市場に即したタイヤの熱劣化耐久試験を短時間に効率良く行うことが出来るものである。   Moreover, when heating the test tire Wx during the test, it is necessary to fill the tire with air or fill the tire with a gas having an oxygen concentration of 60% or more by an oxygen cylinder or the like. This makes it possible to efficiently perform a heat deterioration durability test of a tire in a short time.

以上のように、タイヤ踏面部Ｗｔの周上の一部を、加熱手段２により加熱してタイヤの熱劣化に於ける耐久試験を行うので、市場に即したタイヤの熱劣化耐久試験を短時間に効率良く行うことが出来、また市場に即したタイヤの熱劣化耐久試験を室内試験により精度良く行うことが出来る。また、タイヤの開発精度が向上し、タイヤの開発時間も短縮することが出来る。   As described above, since a part of the circumference of the tire tread surface Wt is heated by the heating means 2 and the durability test in the tire thermal deterioration is performed, the tire thermal deterioration durability test in accordance with the market is performed for a short time. In addition, it is possible to perform a heat deterioration durability test of a tire in accordance with the market with high accuracy by a laboratory test. Further, the tire development accuracy can be improved, and the tire development time can be shortened.

この発明の空気入りタイヤの熱劣化評価試験方法を室内で行う試験装置の概略構成図である。It is a schematic block diagram of the test apparatus which performs the thermal deterioration evaluation test method of the pneumatic tire of this invention indoors. 図１のＡ−Ａ矢視拡大断面図である。It is an AA arrow expanded sectional view of FIG.

符号の説明Explanation of symbols

１ 支持装置 ２ 加熱手段
３ａ ゴムシート ３ｂ ヒータ
３ｃ 電気コード Ｗｘ 試験タイヤ
Ｓｘ ショルダー部 Ｗｔ タイヤ踏面部
Ｈ 加熱手段の幅 Ｌ 加熱手段の長さ
DESCRIPTION OF SYMBOLS 1 Support apparatus 2 Heating means 3a Rubber sheet 3b Heater 3c Electric cord Wx Test tire Sx Shoulder part Wt Tire tread part H Heating means width L Heating means length

Claims (10)

空気入りタイヤの熱劣化評価試験方法において、
タイヤ踏面部周上の一部を、加熱手段により加熱することを特徴とする空気入りタイヤの熱劣化評価試験方法。 In the thermal deterioration evaluation test method for pneumatic tires,
A method for evaluating thermal deterioration of a pneumatic tire, wherein a part of the tire tread surface is heated by a heating means. 前記加熱手段による加熱領域は、タイヤ踏面部全周上の１／３以下，１／６以上である請求項１に記載の空気入りタイヤの熱劣化評価試験方法。 2. The method for evaluating thermal deterioration of a pneumatic tire according to claim 1, wherein the heating area by the heating means is 1/3 or less and 1/6 or more on the entire circumference of the tire tread. 前記タイヤ踏面部の加熱領域は、ショルダー部片側のタイヤ周方向の長さに対して、相対向する側のタイヤ周方向の長さの比を、同じ、または0.89〜0.97に設定する請求項１または２に記載の空気入りタイヤの熱劣化評価試験方法。 The heating region of the tire tread portion is set to the same or 0.89 to 0.97 in the ratio of the length in the tire circumferential direction on the opposite side to the length in the tire circumferential direction on one side of the shoulder portion. Or a method for evaluating thermal deterioration of a pneumatic tire according to 2. 前記タイヤ踏面部の加熱領域は、タイヤ踏面部センターから片側のショルダー部分で、タイヤ周方向の全周または部分的である請求項１，２または３に記載の空気入りタイヤの熱劣化評価試験方法。 4. The method for evaluating thermal deterioration of a pneumatic tire according to claim 1, wherein the heating area of the tire tread portion is a shoulder portion on one side from a tire tread portion center and is the entire circumference or a partial circumference in the tire circumferential direction. . 前記タイヤ踏面部の加熱領域の温度は、表面温度を６０〜１００°Ｃで、かつこの温度状態を９６時間以上維持させる請求項１，２，３または４に記載の空気入りタイヤの熱劣化評価試験方法。 The thermal deterioration evaluation of the pneumatic tire according to claim 1, 2, 3 or 4, wherein the temperature of the heating region of the tire tread surface is a surface temperature of 60 to 100 ° C and the temperature state is maintained for 96 hours or more. Test method. 前記タイヤ踏面部の加熱領域の温度は、加熱領域中心部の温度に対して、加熱領域周方向両端の温度を１０〜３０°Ｃ低くなるように設定する請求項１，２，３，４または５に記載の空気入りタイヤの熱劣化評価試験方法。 The temperature of the heating region of the tire tread is set so that the temperature at both ends in the circumferential direction of the heating region is 10 to 30 ° C lower than the temperature of the center of the heating region. 5. A thermal deterioration evaluation test method for a pneumatic tire according to 5. 前記加熱領域の温度は、一方のショルダー部側の温度に対して、他方のショルダー部側の温度差を１０〜３０°Ｃに設定する請求項１，２，３，４，５または６に記載の空気入りタイヤの熱劣化評価試験方法。 The temperature of the heating region is set such that a temperature difference on the other shoulder portion side is set to 10 to 30 ° C with respect to a temperature on one shoulder portion side. Test method for evaluating thermal degradation of Japanese pneumatic tires. 前記加熱手段として、伝導熱を用いる請求項１，２，３，４，５，６または７に記載の空気入りタイヤの熱劣化評価試験方法。 The thermal deterioration evaluation test method for a pneumatic tire according to claim 1, wherein conduction heat is used as the heating means. 前記タイヤの加熱時に、タイヤ内に空気を充填して行う請求項１，２，３，４，５，６，７または８に記載の空気入りタイヤの熱劣化評価試験方法。 The thermal deterioration evaluation test method for a pneumatic tire according to claim 1, wherein the tire is filled with air when the tire is heated. 前記タイヤの加熱時に、タイヤ内に酸素濃度が６０％以上の気体を充填して行う請求項１，２，３，４，５，６，７，８または９に記載の空気入りタイヤの熱劣化評価試験方法。
The thermal degradation of a pneumatic tire according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the tire is filled with a gas having an oxygen concentration of 60% or more when the tire is heated. Evaluation test method.
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